Buttons rename (#287)

* renaming up/down/click to released/pressed/bump

* missing images

* fixing signature issue

* updated strings

* white lego logo

docs/reference/brick/show-string.md

@@ -18,7 +18,7 @@ Show a greeting on the screen. Then, respond with another message when ENTER is
 ```blocks
 brick.showString("Hello, I dare you to", 1);
 brick.showString("press ENTER...", 2);
-brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+brick.buttonEnter.onEvent(ButtonEvent.Bumped, function () {
 	brick.showString("Hey! Don't push my", 4);
 	brick.showString("buttons.", 5);
 });